/MASK=bitmask

    Allows the user to select individual trace types by the bit
    positions in bitmask that are set to 1.  The /MASK qualifier
    is incompatible with the /SELECT qualifier.

    The bit positions are as follows:

         0 - Extent/Hash Level 1
         1 - Extent/Hash Level 2
         2 - Extent/Hash Level 3
         3 - Extent/Hash Level 4
         4 - Init/Common/Sys Level 1
         5 - Init/Common/Sys Level 2
         6 - Init/Common/Sys Level 3
         7 - Init/Common/Sys Level 4
         8 - LRU/Mem/MemMgt Level 1
         9 - LRU/Mem/MemMgt Level 2
        10 - LRU/Mem/MemMgt Level 3
        11 - LRU/Mem/MemMgt Level 4
        12 - Read/Write Level 1
        13 - Read/Write Level 2
        14 - Read/Write Level 3
        15 - Read/Write Level 4
        16 - (Reserved)
        17 - (Reserved)
        18 - (Reserved)
        19 - (Reserved)
        20 - (Reserved)
        21 - (Reserved)
        22 - (Reserved)
        23 - (Reserved)
        24 - Lock Level 1
        25 - Lock Level 2
        26 - Lock Level 3
        27 - Lock Level 4
        28 - Lock Level 5
        29 - Lock Level 6
        30 - (Reserved)
        31 - (Reserved)